Virtual and augmented reality systems and methods having improved diffractive grating structures
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United States of America Patent
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Mar 13, 2018
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app pub date -
Jan 26, 2016
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Nov 27, 2013
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Abstract
Disclosed is an improved diffraction structure for 3D display systems. The improved diffraction structure includes an intermediate layer that resides between a waveguide substrate and a top grating surface. The top grating surface comprises a first material that corresponds to a first refractive index value, the underlayer comprises a second material that corresponds to a second refractive index value, and the substrate comprises a third material that corresponds to a third refractive index value.
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